Unstable Liquid 3 : A liquid that, in its pure state or as commercially produced, will react vigorously in some hazardous way under shock conditions (i.e., dropping), certain temperatures, or pressures
United States Department of Labor, Occupational Safety & Health Administration (OSHA), Personal Protective Equipment Glossary (OSHA 29 CFR 1910.132), Washington, DC USA 2012. http://www.osha.gov/dte/grant_materials/fy07/sh-16 625-07/ppeglossary3.pdf, (OSHA/ Pers Prot Equip - Amer) {498}